What is the reason not to use select *?

Question

I\'ve seen a number of people claim that you should specifically name each column you want in your select query.

Assuming I\'m going to use all of the columns anyway

Answer 1

It's ok when you're doing exists(select * ...) since it never gets expanded. Otherwise it's really only useful when exploring tables with temporary select statments or if you had a CTE defined above and you want every column without typing them all out again.